/*
 * Copyright (c) 2015 [1076559197@qq.com | tchen0707@gmail.com]
 *
 * Licensed under the Apache License, Version 2.0 (the "License”);
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.study.demo.widget.swipeback;

import android.app.Activity;

import java.lang.reflect.Method;

/**
 * Created by Chaojun Wang on 6/9/14.
 */
public class Utils {
  private Utils() {
  }

  /**
   * Convert a translucent themed Activity
   * {@link android.R.attr#windowIsTranslucent} to a fullscreen opaque
   * Activity.
   * <p/>
   * Call this whenever the background of a translucent Activity has changed
   * to become opaque. Doing so will allow the {@link android.view.Surface} of
   * the Activity behind to be released.
   * <p/>
   * This call has no effect on non-translucent activities or on activities
   * with the {@link android.R.attr#windowIsFloating} attribute.
   */
  public static void convertActivityFromTranslucent(Activity activity) {
    try {
      Method method = Activity.class.getDeclaredMethod("convertFromTranslucent");
      method.setAccessible(true);
      method.invoke(activity);
    } catch (Throwable t) {
    }
  }

  /**
   * Convert a translucent themed Activity
   * {@link android.R.attr#windowIsTranslucent} back from opaque to
   * translucent following a call to
   * {@link #convertActivityFromTranslucent(Activity)} .
   * <p/>
   * Calling this allows the Activity behind this one to be seen again. Once
   * all such Activities have been redrawn
   * <p/>
   * This call has no effect on non-translucent activities or on activities
   * with the {@link android.R.attr#windowIsFloating} attribute.
   */
  public static void convertActivityToTranslucent(Activity activity) {
    try {
      Class<?>[] classes = Activity.class.getDeclaredClasses();
      Class<?> translucentConversionListenerClazz = null;
      for (Class clazz : classes) {
        if (clazz.getSimpleName().contains("TranslucentConversionListener")) {
          translucentConversionListenerClazz = clazz;
        }
      }
      Method method = Activity.class.getDeclaredMethod("convertToTranslucent",
          translucentConversionListenerClazz);
      method.setAccessible(true);
      method.invoke(activity, new Object[] {
          null
      });
    } catch (Throwable t) {
    }
  }
}
